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1 /*
2  *
3  * Copyright (C) 2008, The Android Open Source Project
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  *     http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 
18 #include <dirent.h>
19 #include <fcntl.h>
20 #include <sys/stat.h>
21 
22 #include <diskusage/dirsize.h>
23 
stat_size(struct stat * s)24 int64_t stat_size(struct stat *s)
25 {
26     int64_t blksize = s->st_blksize;
27     // count actual blocks used instead of nominal file size
28     int64_t size = s->st_blocks * 512;
29 
30     if (blksize) {
31         /* round up to filesystem block size */
32         size = (size + blksize - 1) & (~(blksize - 1));
33     }
34 
35     return size;
36 }
37 
calculate_dir_size(int dfd)38 int64_t calculate_dir_size(int dfd)
39 {
40     int64_t size = 0;
41     struct stat s;
42     DIR *d;
43     struct dirent *de;
44 
45     d = fdopendir(dfd);
46     if (d == NULL) {
47         close(dfd);
48         return 0;
49     }
50 
51     while ((de = readdir(d))) {
52         const char *name = de->d_name;
53         if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) {
54             size += stat_size(&s);
55         }
56         if (de->d_type == DT_DIR) {
57             int subfd;
58 
59             /* always skip "." and ".." */
60             if (name[0] == '.') {
61                 if (name[1] == 0)
62                     continue;
63                 if ((name[1] == '.') && (name[2] == 0))
64                     continue;
65             }
66 
67             subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
68             if (subfd >= 0) {
69                 size += calculate_dir_size(subfd);
70             }
71         }
72     }
73     closedir(d);
74     return size;
75 }
76